Led lamp

ABSTRACT

An LED lamp includes a bracket, a supporting plate mounted on the bracket, and a plurality of LED modules mounted on the supporting plate. The bracket includes a bottom plate, two sidewalls and two engaging portions. The two sidewalls respectively connect to two opposite sides of the bottom plate and extend upwardly from the bottom plate. Two protruded portions respectively obliquely extend from inner surfaces of the two sidewalls to define two grooves therebelow, respectively. The supporting plate has two opposite sides respectively slidably received in the grooves. A bottom surface of the supporting plate thermally contacts with a top surface the bottom plate. The LED modules are mounted on a top surface of the supporting plate.

BACKGROUND

1. Technical Field

The invention relates to LED lamps and, more particularly, to an LEDlamp having a number of LED modules which can be easily assembled to ordisassembled from the LED lamp to meet different luminous intensityrequirements.

2. Description of Related Art

The technology of LEDs has rapidly developed in recent years fromindicators to illumination applications. With the features of long-termreliability, environment friendliness and low power consumption, the LEDis viewed as a promising alternative for future lighting products.

A conventional LED lamp comprises a bracket, a number of LED modulesmounted on the bracket, and an envelope adhered to the bracket. Once theLED lamp is fixed under a determined circumstance, a luminous intensityof the LED lamp cannot be changed to meet different requirements.Generally, when it is necessary to change the luminous intensity, theLED lamp needs being totally dissembled and reassembled or redesigned,which is unduly time-consuming and raises production costs.

What is needed, therefore, is an LED lamp having a number of LED moduleswhich can be easily assembled to or disassembled from the LED lamp tomeet different luminous intensity requirements.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an assembled, isometric view of an LED lamp in accordance withan embodiment of the present disclosure.

FIG. 2 is an exploded view of the LED lamp in FIG. 1.

FIG. 3 is an inverted view of the LED lamp in FIG. 2.

FIG. 4 is an isometric view of a bracket of the LED lamp of FIG. 1.

FIG. 5 is a cross-sectional view of the LED lamp in FIG. 1.

DETAILED DESCRIPTION

Referring to FIGS. 1-2, an LED lamp of an embodiment comprises a bracket20, a supporting plate 30 embedded in the bracket 20, three printedcircuit boards (PCBs) 40 mounted on a top surface of the supportingplate 30, a number of LED modules 50 mounted on the PCBs 40, threereflectors 60 covering the LED modules 50, and a transparent envelope 70located at a top of the reflectors 60 and mounted on a top portion ofthe bracket 20. A driving circuit module 10 is mounted on a bottom sideof the bracket 20 and electronically connects with the LED modules 50.

Referring to FIGS. 3-5 also, the bracket 20 is integrally formed byaluminum and has a U-shaped configuration. The bracket 20 comprises anelongated bottom plate 21, two arc-shaped sidewalls 23 and two mountingplates 27. The two sidewalls 23 extend outwardly and upwardly from frontand rear edges of the bottom plate 21. The two mounting plates 27 aremounted on two opposite lateral ends of the bottom plate 21.

The bottom plate 21 has an top surface and a bottom surface. A number offins 212 extend downwardly from the bottom surface of the bottom plate21 to dissipate heat of the bracket 20 absorbed from the LED modules 50.Each of the sidewalls 23 has a convex outer surface and a concave innersurface opposite to the convex outer surface. An elongated protrudedportion 232 protrudes slantwise upwardly from a bottom end of the innersurface of each of the sidewalls 23 and extends along a lengthwisedirection of the bracket 20. The protruded portion 232 extends obliquelyover to the top surface of the bottom plate 21, and therefore anelongated groove 234 is defined between the protruded portion 232 andthe top surface of the bottom plate 21. Opposite ends of the supportingplate 30 are received in the two grooves 234.

An inverted U-shaped transition portion 236 extends upwardly andinwardly from a top end of the sidewall 23. A length of the transitionportion 236 is equal to that of the sidewall 23. An elongated engagingportion 238 extends inwardly and horizontally from a bottom end of thetransition portion 236. A bottom surface of the engaging portion 238 anda bottom surface of the transition portion 236 are coplanar, while a topsurface of the engaging portion 238 is below a top surface of thetransition portion 236. In the present embodiment, the transitionportion 236 and the engaging portion 238 form a step 239 for supportingan edge portion of the envelope 70. A height of the step 239 is equalsto a distance between the top surface of the engaging portion 238 andthe top surface of the transition portion 236. The height of the step239 is larger than a thickness of the edge portion of the envelope 70.The two engaging portions 238 are oriented toward each other tocorporately support the envelope 70. Opposite edge portions of theenvelope 70 sit on the top surfaces of the engaging portions 238 andabut against the transition portions 236. When the envelope 70 ismounted on the bracket 20, top surface of the edge portions of theenvelope 70 are located below the top surfaces of the transitionportions 236.

Each of the mounting plates 27 is a bended metal sheet and has anL-shaped configuration. The mounting plate 27 comprises a bafflingportion 271 and a mounting portion 273 extending outwardly from a bottomend of the baffling portion 271. The two baffling portions 271 of thetwo mounting plates 27 are mounted on the lateral ends of the bracket 20to enclose the supporting plate 30, the PCBs 40, the LED modules 50 andthe reflectors 60 in the bracket 20. The two mounting portions 273 areused to mount the LED lamp at a predetermined position such as a wall, afloor or a ceiling. Two cushions 25 are sandwiched between the bracket20 and the baffling portions 271 respectively to enhance hermeticity ofthe bracket 20.

The supporting plate 30 is an elongated metal plate. Two extendingportions 31 extend outwardly from front and rear edges of the supportingplate 30, respectively. The extending portions 31 extend horizontallyand outwardly from lower portions of the front and rear edges of thesupporting plate 30, respectively. A length of the extending portion 31is equal to that of the supporting plate 30. A width of the extendingportion 31 is equal to or slightly less than a depth of the groove 234of the bracket 20. A width between the two extending portions 31 isequal to that of between the sidewalls 23 of the bracket 20 where thegrooves 234 are located. The extending portion 31 is used to insert in acorresponding groove 234 of the bracket 20. A cutout 33 is defined at aright end of the supporting plate 30.

The PCBs 40 align with each other and are mount on a top surface of thesupporting plate 30. A total length of the PCBs 40 is shorter than thatof the supporting plate 30. When the PCBs 40 are mounted in thesupporting plate 30, the cutout 33 is located outside the PCBs 40. Eachof the reflectors 60 covers a corresponding PCB 40. The reflector 60defines a plurality of through holes 61 to receive the LED modules 50 inthe through holes 61.

In assembly, the PCBs 40 are mounted on the top surface of thesupporting plate 30 and the reflectors 60 are mounted on the PCBs 40 andcover the LED modules 50 on the PCBs 40. In this state, the cutout 33 ofthe supporting plate 30 is located outside the PCBs 40. The PCB 40 withLED modules 50 and the reflector 60 form a light module. The drivingcircuit module 10 is mounted on the bottom side of the bottom plate 21of the bracket 20. A tube-shaped wire guide 90 extends through thebottom plate 21 and is mounted on the bottom plate 21. The extendingportions 31 are inserted in the grooves 234 and slide along the grooves234 until an edge of the supporting plate 30 defining the cutout 33abuts against a periphery of the wire guide 90. In this state, thesupporting plate 30 is received in the bracket 20 and thermally contactswith the top surface of the bottom plate 21. The baffling portions 271of the mounting plates 27 are mounted on the lateral ends of the bracket20 respectively. The cushions 25 are sandwiched between the bracket 20and the baffling portions 271, respectively. Wires (not shown) of thedriving circuit module 10 extend through the wire guide 90 andelectronically connect with the LED modules 50. The envelope 70 adheresto the engaging portions 238. The envelope 70 abuts against thetransition portions 236 of the bracket 20 and the cushions 25. Theenvelope 70, the bracket 20, the cushions 25 and the baffling portions271 of the mounting plates 27 define a hermetic chamber. In this state,the envelope 70 is located at a top of the reflectors 60 and spaced fromthe reflectors 60. The reflectors 60 are sandwiched between the engagingportions 238 and abut against the engaging portions 238. Thus, the LEDlamp is assembled together.

In this embodiment, the supporting plate 30 is slideable along thegrooves 234 of the bracket 20. Thus, the supporting plate 30 togetherwith the light module which includes the PCB 40, the LED modules 50 andthe reflector 60 can be easily assembled to or disassembled from thebracket 20 to change the number of the light module or to maintain theLED lamp by removing the left cushion 25 and mounting plate 27 from thebracket 20. The envelope 70 is spaced from the reflectors 60, thus, theenvelope 70 is not necessary to disassembled from the bracket 20 whenthe supporting plate 30 is assembled to or disassembled from the bracket20.

It is to be understood, however, that even though numerouscharacteristics and advantages of the disclosure have been set forth inthe foregoing description, together with details of the structure andfunction of the disclosure, the disclosure is illustrative only, andchanges may be made in detail, especially in matters of shape, size, andarrangement of parts within the principles of the disclosure to the fullextent indicated by the broad general meaning of the terms in which theappended claims are expressed.

1. An LED lamp comprising: a bracket comprising a bottom plate, twosidewalls and two engaging portions, wherein the two sidewallsrespectively connect to two opposite sides of the bottom plate andextend upwardly from the bottom plate, two opposite grooves arerespectively defined in inner surfaces of the two sidewalls, the twoengaging portions respectively extending inwardly from two top portionsof the two sidewalls respectively; a supporting plate having twoopposite sides respectively slidably received in the two grooves of thetwo sidewalls and thermally contacting with the bottom plate of thebracket; a plurality of light modules including LED modules mounted on atop surface of the supporting plate; and an envelope mounted on tops ofthe engaging portions of the bracket and spaced from the light modules.2. The LED lamp as claimed in claim 1, wherein two extending portionsrespectively extend outwardly from the two opposite sides of thesupporting plate and are respectively received in the two grooves of thetwo sidewalls.
 3. The LED lamp as claimed in claim 2, wherein aprotruded portion protrudes inwardly and upwardly from a bottom end ofthe inner surface of each of the sidewalls and extends along alengthwise direction of each of the sidewals, the protruded portion andthe bottom plate of the bracket defining a corresponding one of thegrooves therebetween.
 4. The LED lamp as claimed in claim 1, wherein aplurality of fins extends downwardly from a bottom surface of the bottomplate.
 5. The LED lamp as claimed in claim 1, wherein the light modulesare sandwiched between the engaging portions and abut against theengaging portions, respectively.
 6. The LED lamp as claimed in claim 1,wherein a transition portion is connected between a correspondingengaging portion and a top end of a corresponding sidewall.
 7. The LEDlamp as claimed in claim 6, wherein a bottom surface of thecorresponding engaging portion and a bottom surface of the transitionportion are coplanar, while a top surface of the corresponding engagingportion forms a step.
 8. The LED lamp as claimed in claim 6, wherein aheight of the step is a distance between the top surface of thecorresponding engaging portion and the top surface of the transitionportion.
 9. The LED lamp as claimed in claim 6, wherein the height ofthe step is larger than a thickness of an edge portion of the envelope.10. The LED lamp as claimed in claim 1, wherein two mounting plates aremounted on lateral ends of the bracket, respectively.
 11. The LED lampas claimed in claim 1, wherein each of the light modules comprises aprinted circuit board with a plurality of LED modules and a reflectormounted on the printed circuit board and covering the LED modules, thereflector being spaced from the envelope.
 12. An LED lamp comprising: abracket comprising a bottom plate and two sidewalls, wherein the twosidewalls respectively connect to two opposite sides of the bottom plateand extend upwardly from the bottom plate, two protruded portionsrespectively extending from inner surfaces of the two sidewalls, theprotruded portions obliquely connecting with a top surface of the bottomplate; a supporting plate having two opposite sides respectivelyslidably arranged between the protruded portions and the bottom plate ofthe bracket, a bottom surface of the supporting plate thermallycontacting with the top surface the bottom plate; a plurality of lightmodules with LED modules mounted on a top surface of the supportingplate.
 13. The LED lamp as claimed in claim 12, wherein a plurality offins extends downwardly from a bottom surface of the bottom plate. 14.The LED lamp as claimed in claim 12, wherein the sidewalls form engagingportion below tops thereof, the light modules are sandwiched between theengaging portions and abut against the engaging portions.
 15. The LEDlamp as claimed in claim 12, wherein a transition portion is connectedbetween a corresponding engaging portion and a top end of acorresponding sidewall.
 16. The LED lamp as claimed in claim 13, whereina bottom surface of the engaging portion and a bottom surface of thetransition portion are coplanar, while a top surface of the engagingportion forms a step, the envelope sitting on the step.